Acceleration of chemistry computations in two-dimensional detonation induced by shock focusing using reduced ISAT

Authors: Dong, G.¹; Fan, B. C.¹; Chen, Y. L.²

Source: Combustion Theory and Modelling, Volume 11, Number 5, October 2007 , pp. 823-837(15)

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Abstract:

A reduced in situ adaptive tabulation (RISAT) method, which was originally proposed by Pope (Combustion Theory and Modelling, 1997, 1, 41-36), is developed for the applications of multidimensional transient reactive flow computations. The RISAT method, which based on the storage/retrieval operation processes of data, employs the constant approximation of chemical reactions and the dynamic deletion of a data table to limit the table size during the computations. It is incorporated in the computations of two-dimensional detonation of CH4/O2 premixed gas induced by shock waves focusing to enhance the computational performance of combustion chemistry. The effects of query tolerance and table size on the computational efficiency are examined. A maximum chemical speedup factor of 17.88 can be obtained by using the RISAT, without losing the computational accuracy. It is concluded from the computational results that the RISAT method is strongly dependent on the table size, tolerance and physics of transient reactive flow problems.

Keywords: In situ adaptive tabulation; Detonation; Combustion chemistry; Computational accuracy and efficiency; transient reactive flow

Document Type: Research article

DOI: http://dx.doi.org/10.1080/13647830701316657

Affiliations: 1: State Key Laboratory of Transient Physics, Nanjing University of Science and Technology, Nanjing, Jiangsu, China 2: Department of Thermal Science and Energy Engineering, University of Science and Technology of China, Hefei, Anhui, China

Publication date: 2007-10-01